Yes, the codes were read from the LED. I'm not able to pull codes from pin 8 as I don't I don't have a code reader.

Regarding the speed signal fault, that one was a real puzzle to me - speedometer works flawlessly, and does not jump in the slightest.

I'm going to try disconnecting the MAF in the morning and see if it changes how the car runs. If not, that would seem to be a likely culprit.